-80.19% is the change from 323 to 64
Calculation steps:
[( 64 - 323 ) ÷ 323] x 100 = -80.19%
Formula
Percentage change = [(64 - 323) / 323] x 100
Subtract the new number by the original number
64 - 323 = -259
-259 ÷ 323 = -0.8018575851393189
-0.8018575851393189 x 100 = -80.19%